how to make a field unique with combination of two fields in the same table

Question

I want to make a field Unique with combination of two fields and it does not show on form

class shipment_charge(osv.osv):
_name = 'shipment.charge'
_columns = {
'type': fields.selection(list_type, 'Type', required=True, ),
'mode': fields.selection(list_mode, 'Mode', required=True, help=""),
'transit_time': fields.selection(list_transit_time, 'Transit Time', required=True, help=""),
'charges_key': fields.char('charges_key', size=64, help=""),
}
_sql_constraints = [
('charges_key_unique', 'unique

Ashif Abdulrahman · Accepted Answer

use this

def check_existance(self, cr, uid, ids, context=None):
self_obj = self.browse(cr, uid, ids[0], context=context)
field1 = self_obj.field1
field2 = self_obj.field2
search_ids = self.search(cr, uid, [('field1', '=', field1),('field2', '=' , field2)], context=context)
res = True
if len(search_ids) > 1:
res = False
return res

and add

_constraints = [(check_existance,'Combination already exist', ['field1'])]

Abhishek H Menon · Answer

_sql_constraints = [
('name_uniq', 'unique(type, mode)', 'The Charges Key is not Unique!'),
]

Please replace this instead of that

Thomas Guénard · Answer

Below the code of a server action which concatenet 2 or more field into a new one

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